03-08-2011, 05:56 PM
(03-08-2011, 01:45 PM)ThePillenwerfer Wrote: I've now finished re-capping this. When it's switched off though there's still 2mA of HT disappearing somewhere.
The switch only disconnects the LT positive and I was wondering if there'd be any harm in using the spare pole to break the HT.
- Joe
That's odd, because the only path to ground from HT would be via C2 or C17 on the Maker's circuit. The only other place that the HT could be leaking to chassis is via an inter-electrode path in one or another of the valves.
It might be worth removing one valve at a time while monitoring the HT current, to see if the culprit can be found.
It was normal practice of course to only switch the LT, because with no volts to the heaters, the valves go to sleeep and no HT should be drawn.
That's the theory, but of course the difference between theory and practice in practice is greater than the difference between theory and practice in theory, if you get my drift!
No reason why if theres' a spare pole on S3, that it can't be used to switch the HT if desired.
David.
(Who is pleased that it is now raining here in biblical proportions, which I hope will cool things down a bit. 25C outdoors, 27C indoors at present).
